I don't care how long you've known him the first guy is not a friend. Don't ever let him touch anything under your hood again. He could be a car wash buddy or a windshield washing pal. He can sit by your car in a lawn chair and be in charge of the feather duster or be the person who gets the pouty doll out of the trunk, but a friend will not complicate things by half assed reassembly of parts.
This is dumb humor, we all make stupid little mistakes that cause us to run in circles.